Add Scheduled Maintenance Changelog

[hardillb]

Document Scheduled restart/stack upgrade

Also fix typo in SSO Session Changelog

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 77.3%, saving 284.7 KB.

Filename	Before	After	Improvement	Visual comparison
src/changelog/2025/12/images/scheduled-maintenance.png	226.4 KB	51.8 KB	77.1%	View diff
src/changelog/2025/12/images/scheduled-maintenance-admin.png	142.1 KB	32.0 KB	77.5%	View diff

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